Dubdub's point is sync the old device to something that you can then sync to the BlackBerry. Desktop Manager offers a couple of solutions, one of them being Outlook. And he mentioned Google. The rest is for you to figure out, i.e. how to sync the old the old device to the WHATEVER you are then going to sync to the BlackBerry.

Another possibility is to use the switch device wizard in Desktop Manager, if the wizard supports the old device.